stainless steel sheets the influence

Obtained without oxidizing the surface of the 409 stainless steel
Bright annealing under protective atmosphere of H2 strip for heat treatment. To achieve the BA board requirements , must be very strictly controlled furnace protective atmosphere to avoid oxidation. H2 oxidation protective atmosphere How did this happen.The main components of stainless steel alloy are Fe, Cr, Ni, Mn, Ti, Si and the like. Within the annealing temperature range , Fe, Ni oxide is not a major problem. However, Cr, Mn, Si, Ti oxide in the range of the heating temperature in the range precisely . Oxidation is the influence of these alloying elements in the steel strip surface brightness . Especially chromium oxide surface of the strips off the chromium reduces stainless steel sheet metal resistance of stainless steel . When the Cr content of 17% ~ 18%, Ti content of 0.5% , H2 dew point must be below -60 ℃, in order to prevent Cr, Ti oxide in the range of 800C ~ 1150 ℃ of heat .